DFRobot Gravity Analog EC Sensors DFR0300 (K=1) & DFR0300-H (K=10) for Arduino/Raspbe, Freshwater to Seawater Conductivity Kitsrry Pi

Overview

Combine DFRobot DFR0300 (K=1) and DFR0300-H (K=10) into one EC (electrical conductivity) series covering freshwater/nutrient solutions through high-salinity seawater/brine. Both boards support 3.0–5.0 V input, BNC probes + PH2.0-3Pin signal, AC excitation (reduces polarization for stable readings and longer probe life), and plug-and-play use with Arduino/Raspberry Pi.

• DFR0300 uses two-point calibration (1413 µS/cm & 12.88 mS/cm), recommended range 1–15 mS/cm (supports 0–20 mS/cm).

• DFR0300-H uses single-point calibration for 10–100 mS/cm high-EC liquids (seawater, concentrated brine).
  A temperature compensation algorithm is available in the libraries; for best accuracy, add a DS18B20 waterproof temperature sensor for automatic compensation.

Applications: hydroponics/aquaponics, freshwater & marine aquaria, aquaculture, environmental & wastewater monitoring, DIY multi-parameter water quality meters.

Model Selection

• DFR0300 (K=1): low–mid EC (freshwater, nutrient solution); supports 0–20 mS/cm; recommended 1–15 mS/cm.

• DFR0300-H (K=10): high EC (seawater, brine, high-salinity wastewater); 10–100 mS/cm.
  Tip: For wide coverage, use both K=1 and K=10 probes with software-selectable calibration profiles.

Key Features (Both Models)

• Plug & play: Gravity connector + BNC probe; no soldering

• AC excitation + hardware filtering: lower polarization/jitter, more stable readings

• Wide supply: 3.0–5.0 V; compatible with 5 V & 3.3 V MCUs

• Calibration: automatic recognition of standard solutions

  • DFR0300: two-point (1413 µS/cm, 12.88 mS/cm)

  • DFR0300-H: single-point

• Temperature compensation algorithm in libraries (recommend DS18B20 for auto-comp)

• Unified board size and connectors for easy mechanical integration

Specifications

DFR0300 (K=1, Lab Grade)

DFR0300-H (K=10, Lab Grade)

*Lab-grade probes are not intended for long-term immersion; continuous soaking shortens lifespan.

What’s in the Box

DFR0300 (K=1)

• EC Probe (K=1, lab grade) ×1

• Signal Conversion Board V2 ×1

• Standard Solutions: 1413 µS/cm ×2, 12.88 mS/cm ×2

• Gravity Analog Sensor Cable ×1

• Waterproof Gaskets ×2; BNC Screw Cap ×1

• M3×10 Nylon Pillars ×4; M3×5 Screws ×8

DFR0300-H (K=10)

• EC Probe (K=10, lab grade) ×1

• Signal Conversion Board ×1

• Standard Solution: 12.88 mS/cm ×4

• Gravity Analog Sensor Cable ×1

• Waterproof Gaskets ×2; BNC Screw Cap ×1

• M3×10 Nylon Pillars ×4; M3×5 Screws ×8

Usage & Care

• Platinum black coating: rinse with distilled water only; do not touch or wipe the coating.

• No long-term immersion: lab-grade probes are for measurements, not permanent online use. For 24/7 monitoring, keep spares or consider industrial probes.

• Temperature compensation: add DS18B20 for automatic compensation and tighter accuracy.

Compatibility & Quick Start

• MCUs: Arduino, Raspberry Pi (5 V / 3.3 V)

• Wiring: Gravity 3-pin to MCU ADC; BNC to probe

• Software: official libraries with calibration & temp-comp examples (DFR0300 two-point; DFR0300-H single-point)

Details

Gravity EC Meter V2.0 with conductivity solutions, sensor probe, and accessories.

DFRobot Gravity Analog Electrical Conductivity Sensor. Measures electrical conductivity in liquids. Features analog output for precise readings. Ideal for water quality monitoring and scientific experiments.